LINQ and lambdas - Get control of your data - enumerable class, IEnumerable interface

Head First C#:
A Learner's Guide to Real-World Programming
with C# and .NET
Kindle版

開発環境

Head First C Sharp: A Learner’s Guide to Real-World Programming with C Sharp and .NET (Andrew Stellman(著)、Jennifer Greene(著)、O’Reilly Media)の Chapter 9(LINQ and lambdas - Get control of your data)、p.525(Exercise)の解答を求めてみる。

コード

Program.cs

using ConsoleApp1;

PowersOfTwo powersOfTwo = new PowersOfTwo();

foreach (int item in powersOfTwo)
{
    Console.WriteLine(item);
}

PowersOfTwo.cs

using System.Collections;

namespace ConsoleApp1;

public class PowersOfTwo : IEnumerable<int>
{
    public IEnumerator<int> GetEnumerator()
    {
        for (int power = 0; power < Math.Round(Math.Log(int.MaxValue, 2)); power++)
        {
            yield return (int)Math.Pow(2, power);
        }
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
}

入出力結果(Terminal, Zsh)

% dotnet run
1
2
4
8
16
32
64
128
256
512
1024
2048
4096
8192
16384
32768
65536
131072
262144
524288
1048576
2097152
4194304
8388608
16777216
33554432
67108864
134217728
268435456
536870912
1073741824
%